o2 sensor fuel trim always 99% HELP! | FerrariChat
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o2 sensor fuel trim always 99% HELP!

Discussion in 'Technical Q&A' started by limoruss, Jan 20, 2009.

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  1. limoruss

    limoruss Karting

    Apr 19, 2008
    55
    Blackpool GB UK
    Full Name:
    Russ Jones
    #1 limoruss, Jan 20, 2009
    I have a Year 2000 Ferrari 360, recently the tickover became erratic and MPG down to well below 10...
    When I connected the autoenginuity OBDII readr I get a constant 99.2% - 99.8% reading from the fuel trim sensor!
    Your advice please people
    Ta
    Russ
    www.lancashirelimos.co.uk
     
  2. Paul_308

    Paul_308 Formula 3

    Mar 12, 2004
    2,345
    #2 Paul_308, Jan 20, 2009
    Can you find another word for tickover? On this side of the pond I've not heard that phrase...

    Any chance the O2 sensor is bad. That failure is not uncommon but in my experience (which does NOT include the F360) the computer goes into 'limp' mode without the excessive fuel usage you experience.
     
  3. Fred2

    Fred2 F1 World Champ
    Silver Subscribed

    Jan 2, 2005
    18,276
    nj
    #3 Fred2, Jan 20, 2009
    Tickover is Idle
     
  4. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,288
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #4 Rifledriver, Jan 20, 2009
    No technology has replaced checking the basics, compression, ignition and fuel.

    Any one of a number of components may have failed but cars run in exactly the same way, goverened by the same rules of physics as they always have and starting a diagnosis in the middle gets nowhere.

    One of my mechanics comes to me with your question and does not have a set of compression numbers written down, I am going to show him the big square hole in the wall I call a door.
     
  5. Maniak

    Maniak Rookie

    Jan 2, 2009
    47
    Amsterdam
    Full Name:
    Marc
    #5 Maniak, Jan 21, 2009
    When I see an enginecode like that.
    It seems a lot of failure on your reader,
    you do have the bible version
    I would go nuts
    Yes I would have a question
     
  6. limoruss

    limoruss Karting

    Apr 19, 2008
    55
    Blackpool GB UK
    Full Name:
    Russ Jones
    #6 limoruss, Jan 22, 2009
    Ok - I decided to leave the autoenginuity reader as its not capable of reading the 2xecu's on the 360....
    After using the car all week I found:

    When engine at normal operating temprature: RPM's intermmitently go from 800 to 1,300. Sometimes it settles back to 1,000
    Will post results of compression test soon as I have done it.
    It sounds to me like its air leaking into the inlet manifold?
    Is there any common air intake leaks in the 360 ?
     
  7. brian.s

    brian.s F1 Rookie
    Professional Ferrari Technician

    Nov 3, 2003
    3,809
    Midwest
    Full Name:
    Brian
    #7 brian.s, Jan 22, 2009
    Thanks Brian, always good for an amusing anecdote! But true as always.
     

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